Per T.B.3.2.5, the tau_0 value for a detector listed spacing of 30 ft and 160 degrees F is 36. The footnote under the table says "RTI=tau_0(5 ft/s)"...(36)*(5)=180.

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David

8/14/2018 12:49:59 pm

It is to the 1/2 power :)

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Colleen

8/14/2018 02:50:02 pm

Drat! That's really confusing, the "(5.0 ft/sec)" in NFPA 72 has a 1 as the upper script and a 2 as the lower, no "/" symbol so it doesn't read as "1/2". I don't have HFPE or FPH in front of me, but hopefully it's on there???

Thanks a lot for pointing that out! I've made note of that in my book.

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